Volunteering gives you a chance _______ lives， including your own．
A． change B． changing
C． changed D． to change
The news came as no surprise to me． I _____ for some time that the factory was going to shut down．
A． knew B． had known
C． have known D． know
Dan Brown，_____ author of The Da Vinci Code， is _____ very famous American writer．
A． a; the B． the; the
C． the; a D． a; a
Jack， it’s too hot here．______ I open the window？
A． Shall B． Will C． Should D． Would
_____ he promised that he wouldn’t be late， he didn’t arrive until the end of the party
A． Since B． Although
C． Because D． Until
Since the new speed limits ______，the number of accidents in the area has fallen strikingly．
A． were introduced
B． introduced
C． have been introduced
D． have introduced
